INFO: task syz-executor:21189 blocked for more than 143 seconds.
Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D
stack:24720 pid:21189 tgid:21189 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0xcda/0x2f80 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1250 [inline]
__down_read kernel/locking/rwsem.c:1263 [inline]
down_read+0x124/0x330 kernel/locking/rwsem.c:1528
kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
d_revalidate fs/namei.c:868 [inline]
d_revalidate fs/namei.c:865 [inline]
lookup_fast+0x239/0x540 fs/namei.c:1679
walk_component+0x5b/0x5b0 fs/namei.c:2035
link_path_walk.part.0.constprop.0+0x669/0xd40 fs/namei.c:2404
link_path_walk fs/namei.c:2336 [inline]
path_openat+0x238/0x2d20 fs/namei.c:3882
do_filp_open+0x1dc/0x430 fs/namei.c:3913
do_sys_openat2+0x17a/0x1e0 fs/open.c:1416
do_sys_open fs/open.c:1431 [inline]
__do_sys_openat fs/open.c:1447 [inline]
__se_sys_openat fs/open.c:1442 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1442
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40b32c6cb1
RSP: 002b:00007fffc6778a10 EFLAGS: 00000287
ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000370 RCX: 00007f40b32c6cb1
RDX: 0000000000090800 RSI: 00007f40b3334de5 RDI: 00000000ffffff9c
RBP: 00007fffc6778aac R08: 000000000005ae94 R09: 00007f40b342a080
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 00000000001e9c66 R14: 00000000001e9c66 R15: 00007fffc6778b00
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0:
ffffffff88cb68a0
(
rcu_read_lock){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6620
2 locks held by getty/2602:
#0: ffff888107a9e0a0
(&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900000432f0
(
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:3/4919:
3 locks held by kworker/0:0/17276:
1 lock held by syz-executor/24803:
#0: ffffffff88cc2038 (rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:328
3 locks held by kworker/0:1/25996:
#0:
ffff888104a8ed48
(
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: raw_spin_rq_lock_nested kernel/sched/core.c:560 [inline]
, at: raw_spin_rq_lock kernel/sched/sched.h:1415 [inline]
, at: rq_lock kernel/sched/sched.h:1714 [inline]
, at: __schedule+0x28e/0x2f80 kernel/sched/core.c:6436
#1:
ffffc90004a6fd80 (kernfs_notify_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
#2: ffffffff88eb2cf8 (kernfs_notify_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
#2: ffffffff88eb2cf8 (kernfs_notify_lock){....}-{2:2}, at: kernfs_notify_workfn+0x80/0x600 fs/kernfs/file.c:900
2 locks held by kworker/0:7/27323:
#0: ffff888100080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1277/0x1b40 kernel/workqueue.c:3206
#1: ffffc90001c3fd80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1b40 kernel/workqueue.c:3207
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf4e/0x1280 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 21189 Comm: syz-executor Not tainted 6.11.0-rc1-syzkaller-00012-gd483f034f032 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:982 [inline]
RIP: 0010:debug_check_no_obj_freed+0x221/0x600 lib/debugobjects.c:1020
Code: 89 64 24 38 49 bd 22 01 00 00 00 00 ad de 48 c1 ea 03 4d 89 fc 80 3c 1a 00 0f 85 dc 00 00 00 48 8d 78 18 41 83 c6 01 4c 8b 38 <48> 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 fa 02 00 00 48 8b 50 18 4c
RSP: 0018:ffffc9000170f8b0 EFLAGS: 00000006
RAX: ffff88811150cc40 RBX: dffffc0000000000 RCX: ffffffff8131f8ed
RDX: 1ffff110222a1988 RSI: ffff888143703000 RDI: ffff88811150cc58
RBP: ffffc9000170f9e8 R08: 0000000000000001 R09: fffff520002e1f04
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888143702000
R13: dead000000000122 R14: 0000000000000011 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d96ab8f200 CR3: 000000011f556000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
free_pages_prepare mm/page_alloc.c:1101 [inline]
free_unref_page+0x2a4/0xce0 mm/page_alloc.c:2612
vfree+0x181/0x7a0 mm/vmalloc.c:3364
kcov_put kernel/kcov.c:429 [inline]
kcov_put+0x2a/0x40 kernel/kcov.c:425
kcov_close+0x10/0x20 kernel/kcov.c:525
__fput+0x408/0xbb0 fs/file_table.c:422
task_work_run+0x14e/0x250 kernel/task_work.c:222
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2b30 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
get_signal+0x25fd/0x2770 kernel/signal.c:2917
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x147/0x260 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40b32c6cb1
Code: Unable to access opcode bytes at 0x7f40b32c6c87.
RSP: 002b:00007fffc6778a10 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: fffffffffffffffe RBX: 0000000000000370 RCX: 00007f40b32c6cb1
RDX: 0000000000090800 RSI: 00007f40b3334de5 RDI: 00000000ffffff9c
RBP: 00007fffc6778aac R08: 000000000005ae94 R09: 00007f40b342a080
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 00000000001e9c66 R14: 00000000001e9c66 R15: 00007fffc6778b00